<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdBottom', i1 === 0 ? 'bdTop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 二级三级权限 -->
              <el-col :span="19">
                <!-- 嵌套渲染二级权限 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdTop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row,item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="(item3) in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row,item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
                    {{scope.row}}
            </pre>-->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <!-- 修改按钮 -->
            <el-button
              type="primary"
              icon="el-icon-edit"
              size="mini"
              @click="showEditDialog(scope.row.id)"
            >编辑</el-button>
            <!-- 删除按钮 -->
            <el-button
              type="danger"
              icon="el-icon-delete"
              size="mini"
              @click="delRoleById(scope.row.id)"
            >删除</el-button>
            <!-- 分配角色按钮 -->
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="mini"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色的对话框 -->
    <el-dialog title="添加角色" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 内容区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="70px">
        <el-form-item label="角色名" prop="roleName">
          <el-input v-model="addForm.roleName" placeholder="请输入角色名称"></el-input>
        </el-form-item>

        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addForm.roleDesc" placeholder="请输入角色描述"></el-input>
        </el-form-item>
      </el-form>

      <!-- 按钮区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改角色的对话框 -->
    <el-dialog
      title="修改角色信息"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="70px">
        <el-form-item label="角色名" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>

        <el-form-item label="描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editUserInfo">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog title="修改角色权限" :visible.sync="rightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree
        :props="treeProps"
        :data="rightslist"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defkeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="rightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色的列表数据
      rolesList: [],
      // 显示与隐藏添加角色的对话框
      addDialogVisible: false,
      // 显示与隐藏修改角色的对话框
      editDialogVisible: false,
      // 显示与隐藏修改角色权限的对话框
      rightDialogVisible: false,
      // 添加角色的表单数据
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      // 添加角色验证规则
      addFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ],
        roleDesc: []
      },
      // 修改角色的对象
      editForm: {},
      // 修改角色验证规则
      editFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ],
        roleDesc: []
      },
      // 所有权限的数组
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的权限值
      defkeys: [],
      // 当前即将分配权限的角色id
      roleId: ''
    }
  },

  created() {
    this.getRolesList()
  },

  methods: {
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败!')
      }
      this.rolesList = res.data
    },

    // 处理添加角色对话框
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },

    // 点击按钮,添加角色
    addRole() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        // 可以发起添加用户的网络请求
        const { data: res } = await this.$http.post('roles', this.addForm)
        if (res.meta.status !== 201) {
          this.$message.error('添加角色失败!')
        }
        this.$message.success('添加角色成功!')
        // 隐藏对话框
        this.addDialogVisible = false
        // 重新获取用户列表
        this.getRolesList()
      })
    },

    // 展示编辑角色的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('获取用户信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },

    // 修改角色信息对话框关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },

    // 修改角色信息并提交
    editUserInfo() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        // 发起修改角色的网络请求
        const { data: res } = await this.$http.put(
          'roles/' + this.editForm.roleId,
          {
            roleName: this.editForm.roleName,
            roleDesc: this.editForm.roleDesc
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改角色信息失败!')
        }
        // 隐藏对话框
        this.editDialogVisible = false
        // 重新获取角色列表
        this.getRolesList()

        this.$message.success('修改角色信息成功!')
      })
    },

    // 根据id删除角色
    async delRoleById(id) {
      // 弹窗询问用户是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      // 点击确认，confirmResult的返回值为confirm
      // 点击取消，confirmResult的返回值为cancel

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }

      const { data: res } = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败，请重试!')
      }
      this.$message.success('删除成功!')
      this.getRolesList()
    },

    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹窗询问用户是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该角色, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }

      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败，请重试!')
      }
      this.$message.success('删除成功!')

      role.children = res.data
    },

    // 显示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败!')
      }
      // 把获取到的权限数据保存到data中
      this.rightslist = res.data
      // 递归获取三级节点id
      this.getLeafKeys(role, this.defkeys)
      this.rightDialogVisible = true
    },

    // 通过递归的形式，获取角色下所有三级权限的id,并保存到defkeys数组中
    getLeafKeys(node, arr) {
      if (!node.children) {
        // 如果当前node节点不包含children属性,则是三级节点
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },

    // 关闭权限分配对话框
    setRightDialogClosed() {
      this.defkeys = []
    },

    // 分配权限管理
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败!')
      }
      this.$message.success('分配权限成功!')
      this.getRolesList()
      this.rightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdTop {
  border-top: 1px solid #eeeeee;
}

.bdBottom {
  border-bottom: 1px solid #eeeeee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
